I have been seeing these notices for a while:
Used in /wp-content/plugins/visitor-maps/visitor-maps.php on line 872 (and several more).
Use wpdb::prepare() or esc_sql() instead.
Deprecated in version 3.6.
This morning I discovered the map is not displaying in WP 3.7.1...
...even though "Who's online" and "Who's been online" are still working at the back.
Has this plugin reached the end of its tour?